Gas plug valve Description
Gas plug valve is a shut-off valve designed for the gas transmission system. It uses a rotating plug body to control the on and off of the gas. Its technical characteristics are as follows:
Core structure and working principle
Valve body structure
Eccentric plug: The center of the plug body deviates from the rotation axis to reduce friction and wear during opening and closing (refer to the design principle of the eccentric valve);
Sealing component: The elastic valve seat (such as fluororubber) and the metal plug body form a two-way seal. When closed, the plug body presses the valve seat to achieve zero leakage;
Operating mechanism: The handwheel or gear box drives the plug to rotate 90° for fast opening and closing, and some are equipped with opening and closing indicators.
Gas adaptation design
Anti-static structure: The built-in spring guides the friction static electricity of the operation to avoid gas detonation;
Full-bore flow channel: Reduce flow resistance and support the passage of pipeline sweepers;
Low structural height: Reduce the installation depth of buried pipelines.
Gas plug valve specification
Main body material
Valve body/plug body: ductile iron (medium pressure), cast steel (high pressure), stainless steel (corrosive gas); Seal material: PTFE or fluororubber (resistant to gas corrosion)
Specification
| Parameter | Range |
|---|---|
| Nominal diameter | DN15～DN300 (DN50-DN200 is commonly used) |
| Pressure level | Class 150～600 (corresponding to PN16～PN100) |
| Temperature range | -20℃～+120℃(Rubber seal) |
Production standard
API 599: Core standard for design and manufacture of metal plug valves; API 6D: General specification for pipeline valves (including high-pressure plug valves).
Testing standard (API 598 / ISO 5208).
Shell strength test: 1.5 times the nominal pressure, pressure maintenance ≥ 3 minutes without leakage;
Seal test: Gas seal: 0.6MPa low-pressure gas detection (for gas leakage prevention);
Liquid seal: 1.1 times the nominal pressure, leakage <0.01DNmm³/s;
Fireproof test: API 607 verifies the sealing performance under fire conditions;
Operation torque test: Full opening and closing torque ≤ calibrated value.
Gas plug valve
Advantages
- Reliable sealing: Combination of soft and hard seals, gas leakage rate close to zero;
- Strong ability to resist impurities: The rotation of the plug has a scraping effect to prevent particles from getting stuck;
- Convenient maintenance: Modular seals can be replaced online;
- Safety redundancy: Anti-static and fireproof structures are suitable for high-risk gas environments.
Core application scenarios
Urban gas pipeline network: underground pipeline shutoff valve, pressure regulating station inlet and outlet;
Liquefied natural gas (LNG) facilities: storage tank inlet and outlet control;
Industrial gas system: metallurgy, glass kiln gas supply line.
Core role
Safety cutoff: rapid isolation of pipeline sections to ensure maintenance and repair safety;
Flow distribution: three-way/four-way plug valve to achieve branch gas switching;
Anti-backflow control: cooperate with check valve to form a gas transmission safety chain.
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